docs: def request_service(self, app_name, port, expected_output=None):
          """
          Make request on service of app. If there is connection error function return False.
          :param app_name: str, name of the app
          :param expected_output: str, If not None method will check output returned from request
                 and try to find matching string.
          :param port: str or int, port of the service
          :return: bool, True if connection was established False if there was connection error
          """
  
          # get ip of service
          ip = [service.get_ip() for service in self.list_services(namespace=self.project)
                if service.name == app_name][0]
  
          # make http request to obtain output
          if expected_output is not None:
              try:
                  output = self.http_request(host=ip, port=port)
                  if expected_output not in output.text:
                      raise ConuException(
                          "Connection to service established, but didn't match expected output")
                  else:
                      logger.info("Connection to service established and return expected output!")
                      return True
              except ConnectionError as e:
                  logger.info("Connection to service failed %s!", e)
                  return False
          elif check_port(port, host=ip):  # check if port is open
              return True
  
          return False